how to insert an image into sql server 2005

Create a Image field in your database.
Load the Image from the disk: Image.FromFile will do it for you.
Connect to your database, with an SqlConnection:

using (SqlConnection con = new SqlConnection(myConnectionString))
   {
   con.Open();
   using (SqlCommand cmd = new SqlCommand("INSERT INTO myTable (imageColumnName) VALUES (@IM)", con))
      {
      MemoryStream ms = new MemoryStream();
      myImage.Save(ms,System.Drawing.Imaging.ImageFormat.Jpg);
      cmd.Parameters.AddWithValue("@IM", ms.ToArray());
      cmd.ExecuteNonQuery();
      }
   }